Let's not try to kid ourselves here. There is one definition of "ghetto" that is used primarily and it is used to describe African-Americans like you did. I don't buy for one minute you meant it any other way, and I suspect several others don't either. At least have the testicular fortitude to stand by what you said and meant rather than pretend there is some other definition that others don't seem to get.
Traditionally, the term "ghetto" has never been used to refer to blacks in particular
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Main Entry: 1ghet·to
Pronunciation: \ˈge-(ˌ)tō\
Function: noun
Inflected Form(s): plural ghettos also ghettoes
Etymology: Italian, from Venetian dial. ghèto island where Jews were forced to live, literally, foundry (located on the island), from ghetàr to cast, from Latin jactare to throw — more at jet
Date: 1611
1 : a quarter of a city in which Jews were formerly required to live
2 : a quarter of a city in which members of a minority group live especially because of social, legal, or economic pressure
3 a : an isolated group <a geriatric ghetto> b : a situation that resembles a ghetto especially in conferring inferior status or limiting opportunity <the pink-collar ghetto>
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It was coined 400 years ago, and originally was confined to jewish concentrations. Since then it has been expanded to include any minority, such as an "Irish ghetto," or a "polish ghetto."